%default {"preinstr":"", "result":"w0", "chkzero":"0"} /* * Generic 32-bit "/2addr" binary operation. Provide an "instr" line * that specifies an instruction that performs "result = w0 op w1". * This could be an ARM instruction or a function call. (If the result * comes back in a register other than w0, you can override "result".) * * If "chkzero" is set to 1, we perform a divide-by-zero check on * vCC (w1). Useful for integer division and modulus. * * For: add-int/2addr, sub-int/2addr, mul-int/2addr, div-int/2addr, * rem-int/2addr, and-int/2addr, or-int/2addr, xor-int/2addr, * shl-int/2addr, shr-int/2addr, ushr-int/2addr, add-float/2addr, * sub-float/2addr, mul-float/2addr, div-float/2addr, rem-float/2addr */ /* binop/2addr vA, vB */ lsr w3, wINST, #12 // w3<- B ubfx w9, wINST, #8, #4 // w9<- A GET_VREG w1, w3 // w1<- vB GET_VREG w0, w9 // w0<- vA .if $chkzero cbz w1, common_errDivideByZero .endif FETCH_ADVANCE_INST 1 // advance rPC, load rINST $preinstr // optional op; may set condition codes $instr // $result<- op, w0-w3 changed GET_INST_OPCODE ip // extract opcode from rINST SET_VREG $result, w9 // vAA<- $result GOTO_OPCODE ip // jump to next instruction /* 10-13 instructions */